Ur earlier post wasn't clear ... I thought u had already done with installing linux ...
Herez how u do non destructive partitioning
Ranish Partition Manager
is by far one of the best freeware partitionig tools i've ever used ... I've been using it from it's beta stages ..n' it's great.
Anywayz .. Download it..
1. Defragment your disk.
2. Run partition manager and change partition size in TWO places: partition table and boot record(you get there when you press Enter). Make sure the size does not drop below minimum partition size.
3. Reboot computer and run SCANDISK to check for errors / adjust FAT-32 free space.
4. Create new partitions.